21012012200212 has 24 divisors (see below), whose sum is σ = 40116759786432. Its totient is φ = 9550219800000.

The previous prime is 21012012200161. The next prime is 21012012200219. The reversal of 21012012200212 is 21200221021012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012012200219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16758993 + ... + 17969080.

It is an arithmetic number, because the mean of its divisors is an integer number (1671531657768).

Almost surely, 2^{21012012200212} is an apocalyptic number.

21012012200212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21012012200212 is a deficient number, since it is larger than the sum of its proper divisors (19104747586220).

21012012200212 is a wasteful number, since it uses less digits than its factorization.

21012012200212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34741839 (or 34741837 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21012012200212 its reverse (21200221021012), we get a palindrome (42212233221224).

The spelling of 21012012200212 in words is "twenty-one trillion, twelve billion, twelve million, two hundred thousand, two hundred twelve".